In this volume leading international environmental philosophers further the debate about the value of nature, the concept of the environment, and the metaphysical, ethical, social and international implications of these concepts. Philosophers have to some extent neglected the study of nature and the natural environment, and this collection not only provides a long-overdue contribution to that study, but also points to inadequacies of much contemporary ethical and political theory. For environmentalists who are not philosophers, it will stimulate reflection on their own concepts and principles.